Manipulation of bistability through the coupling strength in cavity magnon polaritons
Manipulation of bistability through the coupling strength in cavity magnon polaritons
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通过腔磁振子极化子的耦合强度控制双稳态
DOI：
10.1088/1361-6463/ab8f51
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Dai C. J.
中科院分区：
文献类型：
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作者：
Bi M. X.;Yan X. H.;Xiao Y.;Dai C. J.
基于最新的钇铁石榴石（YIG）晶体中磁晶各向异性引起的腔磁振子极化激元非线性的实验结果，我们从理论上提出了一个腔磁振子模型，通过改变耦合强度来研究腔磁振子极化激元的非线性行为，从而呈现出丰富而有趣的现象。在共振情况下，耦合强度越大，上下极化激元模的临界驱动功率越小，耦合强度越小，上下极化激元模的临界驱动功率越大。此外，当耦合强度对YIG球位置的导数由正变负时，上、下极化激元模分别表现出排斥和吸引的特征.特别地，当驱动功率足够强时，下极化激元模的双稳态消失。我们的研究拓宽了对腔磁振子系统非线性的调控手段，为腔自旋电子学和信息处理提供了有前景的应用。
Benefiting from the latest experiment of non-linearity in cavity magnon polaritons due to the magnetocrystalline anisotropy in the yttrium iron garnet (YIG) crystal, we theoretically propose a cavity magnonics model that can be used to study the bistable behaviors by changing the coupling strength, which presents the rich and interesting phenomena. In the case of resonance, the critical driving powers of the upper and lower polariton modes have the smaller values for the larger coupling strength but the larger values for the smaller coupling strength. In addition, the upper and lower polariton modes show the repulsive and attractive features, respectively, when the derivative of the coupling strength with respect to the position of the YIG sphere changes from positive to negative. Especially, the bistability of the lower polariton mode disappears when the driving power is strong enough. Our research broadens the means of manipulation of non-linearity in cavity magnon system, which provides a promising application for cavity spintronics and information processing.